Disclosed herein include methods, compositions, and kits suitable for use in treating and preventing
hair loss. The composition includes a neurokinin 1
receptor (NK1R)
antagonist (e.g.,
aprepitant or a pharmaceutically acceptable salt, solvate, stereoisomer,
prodrug thereof). The composition can be formulated in form of ointment, gel,
lotion, cream, paste,
powder,
pill, tablet, microtablet, pellet, micropellet,
capsule,
capsule containing microtablets, solution, suspension,
emulsion, aerosols, or nanoparticles. The method of treating or preventing
hair loss, comprises administering to a subject a therapeutically or prophylactically effective amount of a composition herein described, for example, by topical application.